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Q.
217 x 217 + 183 x 183 = ?
A.
84521
B.
87487
C.
80578
D.
78458
View Answer
Correct choice: C
Explanation:
(217)2+(183)2 = (200+17)2+(200−17)2 It is in the form of (a+b)2+(a−b)2=2(a2+b2) = 2(40000 + 289) = 80578.
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